[Retracted] Intelligent Optimal Control of Sewage Treatment Based on Multiobjective Evolutionary Algorithm

Table 1

Comparison of iteration steps.

Problem	Iteration steps	MOEA/D	SS-MOEA/D
ZDT1	Maximum	275	228
	Minimum value	153	137
	Average value	235	183
ZDT2	Maximum	360	233
	Minimum value	148	117
	Average value	220	164